Transparent background

I know there are many topic about this, but none of them gave a solution for this problem.

I want to make the main background, the back of the blog, the main page transparent. Why? Because I run the blog mainly inside an iOS app, and I want to show the app on the back, not the WordPress background, so only the text will show up, nothing on the back.

I'm not sure if you can do that to begin with. But a good first step would be to alter your body selector so it refers to the body tag, not an identifier called 'body'. You'll want to drop the number sign there.